Question

Accurate calculation of aircraft height using the glide path deviations and distance information is not practical.

(a) True

(b) False

This question was posed to me during an interview.

This interesting question is from Automatic Landing Systems in section Landing Systems & Air-Traffic Management of Avionics

Answer 1

Right answer is (a) True

Easy explanation: The ILS cannot develop similar information as radar altimeter since the glide slope receiver provides from the zero DDM glide path which is not at a constant height across the width of the localizer course. Therefore, accurate calculation of aircraft height using the glide path deviations and distance information is not practical.